Ok so I've now got
- Xbox to TV HDMI 1 with a brand new HDMI 2.1 cable (not fake certified either).
- TV HDMI 2 to AVR via eARC.
- TV set to mode 2 instead of 3 on HDMI 1
- TV set to mode 3 on HDMI 2
- AVR HDMI set to enhanced
- eARC enabled on the TV
- Xbox gives all the ticks for video output except the 2 for 120hz and VRR is greyed out in video modes
- Xbox audio set to bitstream and Atmos
I then tested in Gears 5, got Dolby Vision popup on the TV but AVR isn't displaying Atmos it just displays "Dolby Surround" and shows the active speakers as 7.1 which I don't even have. If it's being bitstreamed Atmos it would usually say Atmos. Unless this is how Dolby MAT behaves? Or maybe my AVR doesn't even support Dolby MAT. I get the same behavior in Disney+ and Netflix but interestingly they do both show Atmos which they didn't before. I tried the Dolby app and the demo clips play and I can hear the height channels but I don't get Atmos displayed still. All a bit strange.
If I use 5.1 uncompressed in the xbox settings and run the Dolby app demos I get a popup at the bottom of the screen saying I'm not running atmos and the AVR displays Dolby Digital+ and activates more channels than bitstream and Atmos enabled. I spend more time testing it to figure out whats going on but it seems strange to me. If the Xbox is direct into the AVR it displays Atmos but I lose all the video capabilities.
This is what I'm experiencing but with the Xbox I guess, I have 5.1.4.
Did you have passthrough enabled in the Xbox ?
You had greyed out settings because you keep setting it to mode 2 set them both to 3
So the tv earc is working as in built apps going to receiver ok so it’s only the Xbox side gut feeling turn to mode 3 and check pass through
Also are you not looking at the signal received on the av receiver as 5.1.4 the output should be how you configured the av receiver speakers at setup
The other signal coming from the tv apps looks right well is right because it’s not pass through it actually might all be working ok if so change to mode 3 to try 120hz vrr